By using Desired Configuration Manager (DCM) to map the amount of clients with this registry key and package ID

Package ID is available for packages created using CCP 1.8. Package ID is also available for packages created using CCP 1.7 and then modified with CCP 1.8. If, however, you modified a CCP1.7 package using CCP 1.7, even if you modify it later with CCP 1.8, package ID will be available only in the Deployment panel and not in the client machine where the package is deployed.

Note:

We recommend that you use the MSI to uninstall a package and not use the product code present in the registry entry.